Z-axis motion structure for chip mounter

Abstract

The utility model relates to a Z-axis motion structure for a chip mounter, the Z-axis motion structure comprises a mounting rack and a double-motion integrated mechanism, the double-motion integrated mechanism comprises a sliding rail, a sliding seat, a rotary spline, a lifting driving assembly and a rotary driving assembly, the sliding rail is vertically fixed on the mounting rack, the sliding seat is slidably connected with the sliding rail, the rotary spline comprises a spline shaft and a spline sleeve, and the spline sleeve is connected with the rotary spline. The spline sleeve is arranged on the spline shaft in a sleeving mode and matched with the spline shaft to transmit torque and achieve axial sliding, the top end of the spline shaft is rotationally connected with the sliding base, a suction cup is arranged at the bottom end of the spline shaft and used for sucking components, and the spline sleeve is rotationally arranged on the mounting frame and fixed to the mounting frame. The lifting driving assembly is fixed on the mounting frame, connected with the sliding seat and used for driving the sliding seat to ascend and descend, the rotating driving assembly is fixed on the mounting frame, connected with the spline sleeve and used for driving the spline sleeve to rotate, and the chip mounter is low in overall cost and convenient to produce on a large scale.

Description

Technical Field

[0001] This application relates to the technical field of pick and place machines, and more specifically, to a Z-axis motion structure for a pick and place machine. Background Technology

[0002] A pick-and-place machine (SMT) is a core piece of equipment used in surface mount technology (SMT) in electronics manufacturing. It is responsible for accurately and efficiently mounting electronic components (such as resistors, capacitors, chips, etc.) to designated locations on a printed circuit board (PCB).

[0003] The Z-axis motion structure of a pick-and-place machine is one of the core components of the placement head. It primarily controls the movement of the nozzle in the vertical direction (Z-axis) to pick up, inspect, and place components. In Z-axis motion structures that require component orientation and lifting / lowering during pickup, the drive shaft of the Z-axis motion structure must also have rotational functionality. In related technologies, the Z-axis motion structure that achieves rotation and lifting typically includes a ball screw spline shaft and a drive component. The ball screw spline shaft is a composite shaft mechanical component integrating the functions of a ball screw and a ball spline. Driven by the drive component, it can simultaneously achieve automatic linear motion and automatic rotary motion. The rotary drive assembly consists of two components, one driving the ball screw nut and the other the spline nut, and features high precision, high rigidity, and low friction. However, ball screw spline shafts are expensive and have few suppliers, making them unsuitable for the large-scale production needs of pick-and-place machines. Utility Model Content

[0004] To address the issue that in related technologies, the Z-axis motion structure of a pick-and-place machine uses a ball screw spline shaft to achieve rotational and linear lifting motion, which is costly and has few suppliers, making it unsuitable for the large-scale production needs of pick-and-place machines, this application provides a Z-axis motion structure for a pick-and-place machine.

[0005] A Z-axis motion structure for a pick-and-place machine includes a mounting frame and a dual-motion integrated mechanism. The dual-motion integrated mechanism includes a slide rail, a slide block, a rotary spline, a lifting drive assembly, and a rotary drive assembly. The slide rail is vertically fixed to the mounting frame, and the slide block is slidably connected to the slide rail. The rotary spline includes a spline shaft and a spline sleeve. The spline sleeve is sleeved on the spline shaft and cooperates with the spline shaft to transmit torque and achieve axial sliding. The top end of the spline shaft is rotatably connected to the slide block, and the bottom end of the spline shaft is provided with a suction cup for picking up components. The spline sleeve is rotatably mounted on the mounting frame and fixed to the mounting frame. The lifting drive assembly is fixed to the mounting frame and connected to the slide block for driving the slide block to rise and fall. The rotary drive assembly is fixed to the mounting frame and connected to the spline sleeve for driving the spline sleeve to rotate.

[0006] Preferably, the lifting drive assembly includes a first servo motor, a first transmission belt, a first pulley, a second pulley, and a connector. The first servo motor is horizontally fixed on the mounting frame, and the first pulley is fixed on the drive shaft of the first servo motor and coaxially arranged with it. The second pulley is rotatably mounted on the mounting frame, and the first pulley and the second pulley are arranged symmetrically vertically. The two ends of the first transmission belt are respectively sleeved on the first pulley and the second pulley. The connector is fixed on the first transmission belt and connected and fixed to the slide block.

[0007] Preferably, the lifting drive assembly further includes a vertically arranged spring, one end of which is connected and fixed to the connector, and the other end of which is connected and fixed to the mounting bracket.

[0008] Preferably, the rotary drive assembly includes a second servo motor, a second transmission belt, a third pulley, and a fourth pulley. The second servo motor is vertically fixed on the mounting bracket, and the third pulley is fixed to the drive shaft of the second servo motor and coaxially arranged therewith. The fourth pulley is sleeved on the outer wall of the spline sleeve and fixed to the spline sleeve by bolts. The third pulley and the fourth pulley are arranged symmetrically from left to right. The two ends of the second transmission belt are respectively sleeved on the third pulley and the fourth pulley.

[0009] Preferably, there are multiple dual-motion integrated mechanisms, which are arranged laterally on the mounting frame.

[0010] The beneficial technical effects of this application are as follows: A rotary drive assembly drives the spline sleeve to rotate, thereby driving the spline shaft to rotate; a lifting drive assembly drives the slide to lift, thereby driving the spline shaft to lift; a suction cup located at the bottom of the spline shaft picks up components; and the rotation and lifting of the spline shaft drive the components to lift and adjust their orientation. The high rigidity of the spline shaft and the smooth fit with the spline sleeve prevent jamming during high-speed movement, thus maintaining high production efficiency. Furthermore, rotary spline shafts are less expensive than ball screw spline shafts and are readily available, helping to reduce the overall cost of the pick-and-place machine and meet the large-scale production needs of the machine. Independent rotation and lifting control also helps avoid torque interference caused by using coupled ball screw spline shafts. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of a Z-axis motion structure for a pick-and-place machine according to this embodiment.

[0012] Figure 2 This is a schematic diagram of the dual motion integrated mechanism in this embodiment.

[0013] Figure 3 This is a schematic diagram of the mounting bracket in this embodiment.

[0014] Reference numerals: 1. Slide rail; 2. Slide block; 21. First ball bearing; 3. Rotary spline; 31. Spline shaft; 311. Suction cup; 32. Spline sleeve; 321. Annular boss; 4. Lifting drive assembly; 41. First servo motor; 42. First transmission belt; 43. First pulley; 44. Second pulley; 45. Connector; 451. First hook seat; 46. Spring; 5. Rotary drive assembly; 51. Second servo motor; 52. Second transmission belt; 53. Third pulley; 54. Fourth pulley; 6. Flat plate; 61. Through groove; 62. Bearing seat; 63. Second ball bearing; 64. Limiting plate; 65. U-shaped bracket; 66. Second hook seat. Detailed Implementation

[0015] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0016] Reference Figure 1-3A Z-axis motion structure for a pick-and-place machine includes a mounting frame and a dual-motion integrated mechanism. The dual-motion integrated mechanism includes a slide rail 1, a slide block 2, a rotary spline 3, a lifting drive assembly 4, and a rotary drive assembly 5. The mounting frame includes a flat plate 6. The slide rail 1 is vertically fixed to the front side of the flat plate 6. The slide block 2 is slidably connected to the slide rail 1. The rotary spline 3 includes a spline shaft 31 and a spline sleeve 32. The spline sleeve 32 is sleeved on the spline shaft 31 and cooperates with the spline shaft 31 to transmit torque and achieve [the desired function]. Axial sliding, the mating connection between the spline shaft 31 and the spline sleeve 32 is prior art and will not be elaborated upon in this application. A first ball bearing 21 is fixed on the sliding seat, and the top end of the spline shaft 31 passes through the inner ring of the first ball bearing 21 and is fixedly connected to the inner ring of the first ball bearing 21. A suction cup 311 is provided at the bottom end of the spline shaft 31 for picking up components. The lifting drive assembly 4 is fixed to the back of the flat plate 6, and the flat plate 6 is provided with a through groove 61 that penetrates its thickness. The drive assembly 4 connects to the slide 2 via the through slot 61 to drive the slide 2 to rise and fall. The rise and fall of the slide 2 drives the spline shaft 31 to rise and fall. A bearing seat 62 is provided on the front and side of the flat plate 6. A second ball bearing 63 is fixed on the bearing seat 62. The second ball bearing 63 is sleeved on the outer wall of the spline sleeve 32. An annular boss 321 is also provided on the outer wall of the spline sleeve 32 below the second ball bearing 63. A limit plate 64 is also provided on the front and side of the flat plate 6 below the bearing seat 62. The bottom surface of the bearing housing 62 abuts against the top surface of the annular boss 321, and the top surface of the limiting plate 64 abuts against the bottom surface of the annular boss 321. The limiting plate 64 is provided with a through hole for the spline shaft 31 to pass through. The bearing housing 62 and the limiting plate 64 clamp the annular boss 321 to limit the spline sleeve 32, so that the spline sleeve 32 is stable in a fixed position when the spline shaft 31 is raised and lowered. The rotation drive assembly is fixed to the front and side of the flat plate 6 and connected to the spline sleeve 32 to drive the spline sleeve 32 to rotate.

[0017] Reference Figure 1 and Figure 2Furthermore, the lifting drive assembly 4 includes a first servo motor 41, a first transmission belt 42, a first pulley 43, a second pulley 44, and a connector 45. The first servo motor 41 is arranged horizontally, and its housing is connected and fixed to the flat plate 6. The first pulley 43 is fixed to the drive shaft of the first servo motor 41 and is coaxial with it. A U-shaped bracket 65 is provided on the back of the flat plate 6. The second pulley 44 is rotatably mounted on the U-shaped bracket 65, and the first pulley 43 and the second pulley 44 are arranged symmetrically vertically. The two ends of the first transmission belt 42 are respectively sleeved on the first pulley 43 and the second pulley 44. On wheel 44, connector 45 is fixed to the first transmission belt 42 and passes through slot 61 to the front side of the flat plate 6 and is connected and fixed to slide 2. The first transmission belt 42 is installed through the first pulley 43 and the second pulley 44. The first servo motor 41 drives the first pulley 43 to rotate, thereby driving the first transmission belt 42 to drive the connector 45 to move up and down. The moving of connector 45 drives the slide 2 to move up and down. The servo motor drives the slide 2 to move up and down, making the lifting stroke of the slide 2 controllable and the displacement precise. This makes the lifting stroke of the slide 2 driving the spline shaft 31 controllable and the displacement precise.

[0018] Reference Figure 2 and Figure 3 Furthermore, the lifting drive assembly 4 also includes a vertically arranged spring 46, a first hook seat 451 (not shown in the figure) is provided on the connector 45, and a second hook seat 66 is provided on the back of the flat plate 6. The first hook seat 451 and the second hook seat 66 are arranged vertically, and both the first hook seat 451 and the second hook seat 66 are provided with hook grooves. One end of the spring 46 is hooked into the hook groove of the first hook seat 451, and the other end of the spring 46 is hooked into the hook groove of the second hook seat 66 to fix the spring 46. The elastic force of the spring 46 absorbs the impact force of the connector 45 when it descends and stops, reducing vibration and noise, and the tension of the spring 46 reduces the load on the transmission belt.

[0019] Reference Figure 1 and Figure 2Furthermore, the rotary drive assembly includes a second servo motor 51, a second transmission belt 52, a third pulley 53, and a fourth pulley 54. The third servo motor is vertically positioned, and its housing is fixedly connected to the planar plate 6. The third pulley 53 is fixed to the drive shaft of the second servo motor 51 and is coaxially arranged with it. The fourth pulley 54 is sleeved on the outer wall of the spline sleeve 32 and fixed to the spline sleeve 32 with bolts. The third pulley 53 and the fourth pulley 54 are arranged symmetrically from left to right. The two ends of the second transmission belt 52 are respectively sleeved on the third pulley 53 and the fourth pulley 54. The transmission installation of the second transmission belt 52 is realized through the third pulley 53 and the fourth pulley 54. The second servo motor 51 drives the third pulley 53 to rotate, thereby driving the second transmission belt 52 to rotate, which in turn drives the fourth pulley 54 to rotate the spline sleeve 32, causing the spline shaft 31 to rotate. The rotation of the spline shaft 31 is controlled by the servo motor, making the rotation displacement of the spline shaft 31 precise and facilitating precise orientation of components.

[0020] Reference Figure 1 Furthermore, there are multiple dual-motion integrated mechanisms, which are arranged horizontally on the mounting frame, enabling the pick-and-place machine to perform multi-station processing with high efficiency.

[0021] The implementation principle of the Z-axis motion structure for a pick-and-place machine in this application is as follows: The first servo motor 41, together with the transmission belt structure, drives the slide 2 to rise and fall, thereby driving the spline shaft 31 to rise and fall. This allows the suction cup 311 at the end of the spline shaft 31 to contact the component, pick up and fix the component, and lift the component away from the positioning point for easy subsequent transfer operations. The second servo motor 51, together with the transmission belt structure, drives the spline sleeve 32 to rotate, thereby driving the spline shaft 31 to rotate. This allows the spline shaft 31 to adjust the orientation of the component picked up by the suction cup 311, facilitating component positioning. In this application, the high rigidity of the spline shaft 31 and the smooth cooperation with the spline sleeve 32 make it less prone to jamming during high-speed movement, which is conducive to maintaining high production efficiency. Moreover, the rotary spline shaft 31 is less expensive than the ball screw spline shaft 31, and the supply is sufficient, which helps to reduce the overall cost of the pick-and-place machine and meet the needs of large-scale production of the pick-and-place machine. Furthermore, the independent rotation control and lifting control help to avoid the torque interference generated when using the coupled ball screw spline shaft 31.

[0022] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A Z-axis motion structure for a pick-and-place machine, characterized in that: The device includes a mounting bracket and a dual-motion integrated mechanism. The dual-motion integrated mechanism includes a slide rail, a slide block, a rotary spline, a lifting drive assembly, and a rotary drive assembly. The slide rail is vertically fixed to the mounting bracket, and the slide block is slidably connected to the slide rail. The rotary spline includes a spline shaft and a spline sleeve. The spline sleeve is sleeved on the spline shaft and cooperates with the spline shaft to transmit torque and achieve axial sliding. The top end of the spline shaft is rotatably connected to the slide block, and the bottom end of the spline shaft is provided with a suction cup for picking up components. The spline sleeve is rotatably mounted on the mounting bracket and fixed to the mounting bracket. The lifting drive assembly is fixed to the mounting bracket and connected to the slide block for driving the slide block to rise and fall. The rotary drive assembly is fixed to the mounting bracket and connected to the spline sleeve for driving the spline sleeve to rotate.

2. The Z-axis motion structure for a pick-and-place machine according to claim 1, characterized in that: The lifting drive assembly includes a first servo motor, a first transmission belt, a first pulley, a second pulley, and a connector. The first servo motor is horizontally fixed on the mounting frame, and the first pulley is fixed on the drive shaft of the first servo motor and coaxially arranged with it. The second pulley is rotatably mounted on the mounting frame, and the first pulley and the second pulley are arranged symmetrically vertically. The two ends of the first transmission belt are respectively sleeved on the first pulley and the second pulley. The connector is fixed on the first transmission belt and connected and fixed to the slide block.

3. The Z-axis motion structure for a pick-and-place machine according to claim 2, characterized in that: The lifting drive assembly also includes a vertically arranged spring, one end of which is fixedly connected to the connector and the other end of which is fixedly connected to the mounting bracket.

4. The Z-axis motion structure for a pick-and-place machine according to claim 1, characterized in that: The rotary drive assembly includes a second servo motor, a second transmission belt, a third pulley, and a fourth pulley. The second servo motor is vertically fixed on the mounting bracket, and the third pulley is fixed to the drive shaft of the second servo motor and coaxially arranged with it. The fourth pulley is sleeved on the outer wall of the spline sleeve and fixed to the spline sleeve by bolts. The third pulley and the fourth pulley are arranged symmetrically from left to right. The two ends of the second transmission belt are respectively sleeved on the third pulley and the fourth pulley.

5. The Z-axis motion structure for a pick-and-place machine according to claim 1, characterized in that: The number of dual-motion integrated mechanisms is multiple, and the multiple dual-motion integrated mechanisms are arranged laterally on the mounting frame.

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